from multiprocessing import Process
from queue import Queue
from threading import Thread, Event, Lock
import argparse
import os
from common.helper.logging import Logging
from setup.config import load_config
import pytz
from src.bosses import Bosses
import keyboard
import time


class Email(Process):
    def __init__(self, configs, params, setup):
        super(Email, self).__init__()

        self.configs = configs
        self.params = params
        self.registry = {}
        self.workers = []
        self.working = []
        self.worker_status = []

        self.add_event('stop')

    def setup(self, data):
        for (m, n) in data['workers']:
            self.register_worker(m, n)
        for q in data['queues']:
            self.add_queue(q)
        for e in data['events']:
            self.add_event(e)
        for l in data['locks']:
            self.add_lock(l)

    def register_worker(self, module, name):
        if module not in self.registry:
            self.registry[module] = []
        self.registry[module].append(name)

    def add_worker(self, worker):
        self.workers.append(worker)

    def start_worker(self, module, name):
        worker = getattr(module, name)
        self.add_worker(worker)
        self.working.append((module, name))
        worker.start()
        self.worker_status.append(True)

    def start_workers(self):
        for module, workers in self.registry:
            for name in workers:
                self.start_worker(module, name)

    def check_workers(self):
        stopped = 0
        for (k, w) in enumerate(self.workers):
            if not self.worker_status[k]:
                stopped += 1
                continue
            if not w.is_alive():
                self.params['logging'].log('Worker {0} stopped'.format(type(w)))
                self.params['queues']['log'].put({'not': True, 'action': type(w)})
                stopped += 1
                self.worker_status[k] = False
                (m, n) = self.working[k]
                # Restart worker
                self.start_worker(m, n)
        if stopped == len(self.workers):
            return False
        return True

    def join_workers(self):
        [w.join(self.configs.get('supervisor.wait')) for w in self.workers if w.is_alive()]

    def add_queue(self, name):
        if 'queues' not in self.params or self.params['queues'] is None:
            self.params['queues'] = {}
        self.params['queues'][name] = Queue()

    def add_event(self, name):
        if 'events' not in self.params or self.params['events'] is None:
            self.params['events'] = {}
        self.params['events'][name] = Event()

    def add_lock(self, name):
        if 'locks' not in self.params or self.params['locks'] is None:
            self.params['locks'] = {}
        self.params['locks'][name] = Lock()

    def run(self) -> None:
        self.start_workers()
        self.add_worker(Thread(target=exit_thread, args=(self.params['events']['stop'], self.params['logging'])))

        while not self.params['events']['stop'].is_set():
            if not self.check_workers():
                break
            time.sleep(self.configs.get('supervisor.wait'))
        self.join_workers()


def exit_thread(stop, logger):
    logger.log('Starting exit thread', caller='exit_thread')
    keyboard.wait('Esc')
    logger.log('Escape pressed', caller='exit_thread')
    stop.set()
    logger.log('Exit signal sent', caller='exit_thread')


def main(args):
    configs = load_config(args.config_folder)
    configs.set('timezone', pytz.timezone('America/Santiago'))
    params = {
        'folders': {
            'config': args.config_folder,
            'log': args.log_folder,
            'data': args.data_folder
        },
        'bosses': Bosses(args.data_folder),
        'logging': Logging(configs.get('timezone'), args.log_folder)
    }

    setup = {
        'workers': [
            ('common.helper.logger', 'Worker'),
            ('src.email', 'Obtenedor'),
            ('src.email', 'Validador')
        ],
        'queues': ['log', 'emails', 'valid', 'invalid'],
        'events': [],
        'locks': []
    }

    email = Email(configs, params, setup)

    email.start()
    email.join()


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('-c', '--config_folder', default=os.path.join(os.path.realpath('../..'), 'config'))
    parser.add_argument('-d', '--data_folder', default=os.path.join(os.path.realpath('../..'), 'data'))
    parser.add_argument('-l', '--log_folder', default=os.path.join(os.path.realpath('../..'), 'logs'))
    _args = parser.parse_args()
    main(_args)